/* =========================
   Design tokens
========================= */
:root {
  --bg: #f6f8fb;
  --panel: rgba(255, 255, 255, 0.7);
  --border: rgba(148, 163, 184, 0.35);
  --text: #0f172a;
  --muted: #64748b;

  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  --shadow2: 0 8px 18px rgba(15, 23, 42, 0.08);

  --blue: #3b82f6;
  --red: #e11d48;
}

/* =========================
   Base
========================= */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
}

/* =========================
   Topbar
========================= */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1800px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Search */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  font-size: 13px;
  opacity: 0.6;
}

.search {
  width: 320px;
  height: 38px;
  padding: 0 12px 0 34px;
  border: 1px solid var(--border);
  background: rgba(241, 245, 249, 0.7);
  border-radius: 999px;
  outline: none;
  transition: 0.2s ease;
}

.search:focus {
  background: white;
  border-color: rgba(59, 130, 246, 0.45);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

/* =========================
   Buttons
========================= */
.btn {
  height: 38px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: white;
  color: #334155;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:hover {
  background: #f8fafc;
}

.btn-icon {
  font-weight: 900;
}

.btn-danger {
  background: rgba(225, 29, 72, 0.08);
  border-color: rgba(225, 29, 72, 0.25);
  color: var(--red);
}

.btn-danger:hover {
  background: rgba(225, 29, 72, 0.14);
}

.btn-primary {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.25);
  color: var(--blue);
}

.btn-primary:hover {
  background: rgba(59, 130, 246, 0.18);
}

/* Icon buttons (edit/delete icons) */
.icon-btn {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(255, 255, 255, 0.65);
  cursor: pointer;
  transition: 0.2s ease;
  display: grid;
  place-items: center;
  color: #64748b;
}

.icon-btn:hover {
  background: white;
  border-color: rgba(148, 163, 184, 0.35);
  color: #334155;
}

.icon-danger:hover {
  color: var(--red);
  border-color: rgba(225, 29, 72, 0.25);
  background: rgba(225, 29, 72, 0.08);
}

/* =========================
   Layout
========================= */
.page {
  max-width: 1800px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

.board {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}

.board-scroll {
  overflow-x: auto;
  padding-bottom: 10px;
}

.board-scroll::-webkit-scrollbar {
  height: 8px;
}

.board-scroll::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 999px;
}

/* =========================
   Columns
========================= */
.column {
  width: 320px;
  flex: 0 0 320px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(241, 245, 249, 0.55);
  padding: 14px;
}

.column-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 10px;
}

.col-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.col-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.col-title-text {
  margin: 0;
  font-size: 14px;
  font-weight: 800;
  color: #334155;
  cursor: pointer;
}

.badge {
  font-size: 11px;
  font-weight: 800;
  color: #475569;
  background: rgba(148, 163, 184, 0.25);
  border-radius: 999px;
  padding: 3px 8px;
}

.col-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.col-title-input {
  width: 100%;
  height: 34px;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 0 10px;
  outline: none;
}

.col-title-input:focus {
  border-color: rgba(59, 130, 246, 0.45);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

/* Add task button (dashed) */
.add-task {
  width: 100%;
  height: 36px;
  border-radius: 14px;
  border: 2px dashed var(--border);
  background: transparent;
  color: #64748b;
  cursor: pointer;
  transition: 0.2s ease;
  font-weight: 700;
}

.add-task:hover {
  border-color: rgba(59, 130, 246, 0.5);
  color: var(--blue);
  background: rgba(59, 130, 246, 0.06);
}

/* =========================
   Tasks
========================= */
.tasks {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 40px; /* clave: permite drop en listas vacías */
}

.task {
  background: white;
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 14px;
  padding: 12px;
  box-shadow: var(--shadow);
}

.task:hover {
  box-shadow: var(--shadow2);
  border-color: rgba(59, 130, 246, 0.25);
}

.task.dragging {
  opacity: 0.5;
}

.task-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.task-title {
  margin: 0;
  font-size: 13px;
  font-weight: 650;
  color: #334155;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* mostramos acciones solo al hover */
.task-actions {
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: 0.2s ease;
}

.task:hover .task-actions {
  opacity: 1;
}

/* Drop placeholder */
.drop-placeholder {
  height: 44px;
  border-radius: 14px;
  border: 2px dashed rgba(59, 130, 246, 0.35);
  background: rgba(59, 130, 246, 0.06);
}

/* =========================
   Ghost column (add list)
========================= */
.ghost-column {
  width: 320px;
  flex: 0 0 320px;
  height: 48px;
  border-radius: 18px;
  border: 2px dashed rgba(148, 163, 184, 0.5);
  background: rgba(148, 163, 184, 0.12);
  color: #64748b;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
  transition: 0.2s ease;
}

.ghost-column:hover {
  background: rgba(148, 163, 184, 0.18);
  border-color: rgba(100, 116, 139, 0.55);
  color: #334155;
}

.ghost-plus {
  font-size: 18px;
}

/* =========================
   Modal
========================= */
.modal-backdrop[hidden] {
  display: none;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.35);
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal {
  width: min(520px, 92vw);
  background: white;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.18);
  padding: 16px;
}

.modal-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 900;
}

.modal-input {
  width: 100%;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 0 12px;
  outline: none;
}

.modal-input:focus {
  border-color: rgba(59, 130, 246, 0.45);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

.modal-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 14px;
}

/* =========================
   Responsive
========================= */
@media (max-width: 900px) {
  .topbar-inner {
    gap: 12px;
  }

  .app-title {
    display: none; /* deja más espacio en mobile */
  }

  .search {
    width: 220px;
  }
}